Research Of GPR's Underground Goal Object Scattering Issues Based On FDTD

This study focuses on ground-penetrating radar technology. As an effective detection method, ground-penetrating radar technology has been widely used in the reality of project. This paper introduces the GPR technology historical process, the GPR development status and predicts the future trends of GPR from the aspect of hardware devices, theoretical research, and date processing.This dissertation analyzes the basic system of GPR and the role of each part. Also it introduces the basic principles of GPR and the electromagnetic wave propagation properties of the soil. The typical GPR system:the frequency and pulse signals progress GPR are analyzed. The main methods of observation and date collection methods are described.GPR detect Underground target problem can be converted to calculating the actual electromagnetic field problem, so which method of calculating electromagnetic field proper is important. This paper introduces three typical methods of calculating electromagnetic field:analytical method, numerical method and semi-analytical numerical method. Describe the basic ideas of these methods, their advantages and disadvantages, this paper will analysis GPR detect Underground target problem based on the finite difference time domain.Finite difference time domain analysis method is introduced, also the Maxwell equations and the two-dimensional space of expression. The second matched layer absorbing boundary condition and perfectly layer absorbing boundary condition is studied. Explain how to choose the ground penetrating radar system emission source. By means of MATLAB and C language, the emission and scattering of the pulse phenomenon is simulated. Simulate the medium without target object and with target object. Under different simulation condition, the corresponding result is given.